Multistage pump plunger



Oct. 18,1927, L c BLACK --1,646,134

MuLTrsTAGE PUMP mum-,Ea

' Filed sept. 2, 1925 luren ron "Zas/ef C. /Oc/r TTWIIIEYS Patented oef. is, 1927.

'iaUnTI'STAGE ruilt? LNGER." f

j' T his invention relates lto pump plungrs 'which are adapted t'obe used'i'n'iiultiistage pumps.V By `multi-stage Vpuinp's 1sk meant pumps 'iir -Whicht the plunger is providetllvvith a plurality "oi: cups anda pluralityof valves 'corresponding' to :the cups v*so vthat ltheaA pres-` suie iioiii" the "coluiiii'aV of li'quid abovethe *plunger yis distributed Ilover al plurality'iof valves. iItis fan lobject of "this Iinventioi'ifloconstiuct 'a' plunger forA Vsuch a pui'npliii which a plurality of selahgni'ngcpsus provided. Itis further proposed to provide each ot' 'the cups VWitha valve located adjacent tlie'bot-tom of the cups.

lt' isa further object of 'theyinventiofn to construct a L plunger iir Which `Vthe Wearing parts are 'especially adaptable' to Jthe use Lfoit' manganese steel. i y

It is a further obje'ct'ottl inventionto const'ructf'a `plunger in a'plurality 'of sections which may be readily assembled togther'tto form a complete plungenandinn ich the parts of the different sections are identical. v'lt" "isfa: further object of the invention to consti-uct a multi-stage plunger which is especially adapted for use in oil Wells 'and' which may be readily and cheaply manufactured7 is simple in construction and Will give a high pumping eliiciency.

Further objects will appear from the following speciication in which I have described tlie preferred embodiment of my invention.

Referring to the drawing:

Figure 1 is a cross sectional elevation of the plunger inserted in a pump cylinder with the plunger in its raised position. y

Figure 2 is similar to Fig. 1 but shows the plunger in its loiver position.

Figure l is a cross sectional view taken along the line 3 3 of Fig. 1.

Figure 4f. is a cross sectional view taken` Figure 5 is a det-ail olY one section of the plunger rod.

In Figs. 1 and 2 of the drawing, the plungupon-the line l-lot Fig. 1.

Y er is shown as positioned within a pump cylinderor barrel 10. The plunger comprises generally a plunger rod 1.1 Which is attached at its upper end to a suitable reciprocating pump rod. This plunger rod hasdisposed upon vit at spaced points the plunger cups or collars 12 Which'are adapted to snugly lit into the pump barrel 10;

These cups 12 are preferably made ol' manganese steel alloy, although it is undery vention -1are` `Eapplicable with plunger '.c'u'ps i'i'iade 'olf other materials, "such as any su-litable'inz'etah leather,*composition or r`fabric; Manganesle steel has `eXtraordin'ary "Wearing qualities 5`a"n"d"w`i'll maintain-its 'originali ilini'sli' and dimensions; [thuspreventing sand from "Worlringfbetween the" cupsvr and the pump bar-` frel toseofre the working'suiiface ofthefbarrel. @Hdw'ever -nianganese steel is Yvery f difficult to machine. This tdifficulty is: minimized in;

this invention-by rmakinfglthe plunger 'ci-ips of veryfsiinpleconstruction. `V 'llius'ea'cli of the cups con'iprisesfnierely a' cylindrical member f'forins af'portion of the'fvalve element tobc described y:present-ly. The feu'p's 12 are" positione'd at `v'spaced points along the plunger rod 11 and are'pij'eferablyfsecured thereto'by "the v7sleeve'slWhiehhave openings therein to receive the positioning r'lguidef-portions'l 'fof the plunger rod. The l itfbetween the sleeves 13 and the positioning or guide porsteed A that the 'ether lie-vel features ef the i tions 15 is a comparativelyr loose one so that .the cups are free to align themselves sepa rately to fit the vpuinpbarrel.A The upper' edges of these cups are preferably beveled as at 14 so as to prevent sand from getting g in between the pump cylinder and the outer surfaces of the cups. This beveled edgealso serves toA direct sand down into the cup.

Each ofthe plunger cups or collars is provided With individual valves which are preterably located adjacent the bottoms of the cups so that sand will not accumulate in the interior of the cups; The construction of these valves Will be described .later together with the sections of the plunger rod.

It has been found preferable to construct. the plunger rod in a plurality of sections such as 111, 211 and 311. It is also preierred to make these sections identical so that broken sections may be` readily replaced. Fig. 5 shows the construction'of one of these sections Whicheomprises a rod having screvvr tli'i'eadedattaching means 16 and 17 at its ends. f The `upper end of the rod section is providedwitli a-valve seat 18Wliich is adapt any other metalorother material which will give a fluid-tight contact with thedepending portion 19 of one oit' the cups 12. The lower end of each rod section is provided with a guide portion 15 previously referred to. 1

This guide portion terminates with a shoulder 22 which is provided to limit the upward mov-ement of the cup 12 on the guideportion 15. Each rod section is also provided with suitable ports for the passage of liquid which `may be in the form of grooves 23 extending roma point abovethe shoulder 22 .to a point adjacent the lower end of the guide portion 15. Ywith a plunger cup 12 positioned oneach .one of the guide portions'15', the 'plunger cups'willbe tree to have limited longitudinal movement with ,respect to the plunger rod 4upon reciprocation of the latter. Upon the upstroke of the plunger rod the depending portions 19 of the plunger cups will contact with the valve seats 18 to effectively seal the rspace. between the plunger cups and the plunger rod. Upon the down stroke of the plunger rod as shown in Fig. 2 the plunger cups 12 will move upwardly with respect to the plunger rod and the depending portions 19 will be lifted clear of the valve seats 18,

VVhen the rod sections-are assembled.

tions can be assembled or replaced at will. The number Vof these sections employed will of course depend upon the number of stages which it is desired to employ.

I claim:

1. A device of the class described comprising a plunger rod formed in at least two sections, means providing a screw threaded engagement between said sections, a at annular valve seat formed on the lower section adjacent its upper end, a guide portion on the lower end of the upper section, a plunger cup surrounding the upper section, the lower end of the cup having a portion of reduced diameter to loosely lit` said guide portion, a shoulder on the upper section to limit the upward movement` of the plunger cup relative to the rod, and means on the lower end of the cup adapted to cooperate with the valve seat.

2. A multi-stage pump plunger comprising a rod formed of a plurality of identical sections, each section having a valve seat formed adjacent its upper end, an integral guide portion on its lower end, and an integral shoulder adjacent the guide portion, and a cup plunger cooperating with each section, each plunger having a lower portion of reduced diameter adapted to loosely fit a guide portion.

In testimony whereof, I have hereunto set my hand.

LESTER C. BLACK. 

